Did Microsoft underestimate Sony?

I went to my local Target store to buy a PS4. They didn't have any. Then, I went to my local Wal-Mart store. They didn't have any either. So I went to three other Target and Walmart stores, and a GameStop, and no luck.

I asked at every store I went to if they had any in stock, and they said no, but that they had plenty of Xbox One's. Surely enough, the Xbox One's were just collecting dust. The countless workers just said most people come in for a PS4 and when when they receive a batch they're gone by morning.

I know this is a silly post, but I'm surprised six stores and a GameStop were out of stock.

Thoughts! Did Microsoft underestimate Sony? I certainly think so. It seems the PS4 is the must own console.